Abstract
A method is described for the generation of micrometer-sized vapor-gas bubbles in a water suspension containing absorptive pigment nanoparticles. The diluted suspension (mean interparticle distance 20 μm) absorbs the continuous laser radiation (wavelength 808 nm), and each particle in the best illuminated volume (~10 × 10 × 200 μm3) serves as a bubble-nucleation center. The suspension heating is inessential (several degrees above the room temperature) and the bubbles are formed mainly of the air gases dissolved in water. The bubbles can stably exist within or near the illuminated area where their location is governed by the competition between thermal and optical forces and can be controlled via the laser beam parameters. The method enables controllable creation, support, prescribed transportation, and destruction of the bubbles. This can be useful in applications aimed at precise sorting, transportation, and delivery of species in nano- and micro-engineering as well as for biomedical studies.
Highlights
During the past years, great attention has been attracted to the generation and manipulation of nano- and microbubbles in aqueous solutions [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
A method is described for the generation of micrometer-sized vapor-gas bubbles in a water suspension containing absorptive pigment nanoparticles
The bubbles can stably exist within or near the illuminated area where their location is governed by the competition between thermal and optical forces and can be controlled via the laser beam parameters
Summary
Great attention has been attracted to the generation and manipulation of nano- and microbubbles in aqueous solutions [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. Contrary to [15], the suspension was diluted so that superheating of the nearest vicinity of a single pigment particle provided but a weak warming of the ambient water volume In such conditions, microbubbles can still be generated around the absorbing pigment particles but they predominantly contain the air gases dissolved in water [14]. Microbubbles can still be generated around the absorbing pigment particles but they predominantly contain the air gases dissolved in water [14] Their existence and evolution are governed by a sensitive balance between the energy supplied due to the particle’s absorption and the heat and mass diffusivity in the ambient water, which offers relevant channels for controlling the bubbles. Their competition provides some interesting and potentially useful manifestations in the bubbles’ motion and spatial localization that can be employed in practice
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